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<H2><A NAME="10_7">10.7 Gantt bars</A></H2>
<P> The most common of all object in a Gantt chart is of course the
 activity bar (GanttBar()). In terms of formatting this object has a
 very large flexibility. The full signature for the GanttBar constructor
 is<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
&nbsp;</FONT><FONT color="#007700">function&nbsp;</FONT><FONT color="#0000BB">
GanttBar</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
$aVPos</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">$aTitle</FONT><FONT
color="#007700">,</FONT><FONT color="#0000BB">$aStart</FONT><FONT color="#007700">
,</FONT><FONT color="#0000BB">$aEnd</FONT><FONT color="#007700">,</FONT><FONT
color="#0000BB">$aCaption</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
$aHeight</FONT><FONT color="#007700">)</FONT><FONT color="#0000BB"></FONT>
</FONT></CODE></DIV></P>
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<TR><TD valign="top">
<!--span style=&quot;font-family:times;font-size:85%;font-weight:bold;&quot;-->
<CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$aVPos&nbsp;</FONT></FONT>
</CODE></TD><TD valign="top">&nbsp;</TD><TD>The vertical position for the
 bar, [0..n]</TD></TR>
<TR><TD valign="top">
<!--span style=&quot;font-family:times;font-size:85%;font-weight:bold;&quot;-->
<CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$aTitle&nbsp;</FONT></FONT>
</CODE></TD><TD valign="top">&nbsp;</TD><TD>Title for the activity</TD></TR>
<TR><TD valign="top">
<!--span style=&quot;font-family:times;font-size:85%;font-weight:bold;&quot;-->
<CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$aStart&nbsp;</FONT></FONT>
</CODE></TD><TD valign="top">&nbsp;</TD><TD>Start date for the activity given
 as string, e.g &quot;2001-09-22&quot;</TD></TR>
<TR><TD valign="top">
<!--span style=&quot;font-family:times;font-size:85%;font-weight:bold;&quot;-->
<CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$aEnd&nbsp;</FONT></FONT></CODE>
</TD><TD valign="top">&nbsp;</TD><TD>End date for activity given as<B> either</B>
 a date (a string) or as the duration (in days) of the activity, e.g
 both &quot;2001-10-15&quot; and 20.5 are valid inputs</TD></TR>
<TR><TD valign="top">
<!--span style=&quot;font-family:times;font-size:85%;font-weight:bold;&quot;-->
<CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$aCaption&nbsp;</FONT></FONT>
</CODE></TD><TD valign="top">&nbsp;</TD><TD>Text string (caption) to appear
 at the end (right side) of the bar</TD></TR>
<TR><TD valign="top">
<!--span style=&quot;font-family:times;font-size:85%;font-weight:bold;&quot;-->
<CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$aHeight&nbsp;</FONT></FONT>
</CODE></TD><TD valign="top">&nbsp;</TD><TD>Height of bar given as<B> either</B>
 a value in range [0,1] in which case this is interpretated as what
 fraction of the vertical position should the bar occupy. The height can
 also be given in absolute pixels [1..200]</TD></TR>
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